/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.zookeeper.server.quorum;

public class QuorumStats {
	public interface Provider {
		static public final String FOLLOWING_STATE = "following";
		static public final String LEADING_STATE = "leading";
		static public final String LOOKING_STATE = "leaderelection";
		static public final String OBSERVING_STATE = "observing";
		static public final String UNKNOWN_STATE = "unknown";

		public String[] getQuorumPeers();

		public String getServerState();
	}

	private final Provider provider;

	protected QuorumStats(Provider provider) {
		this.provider = provider;
	}

	public String[] getQuorumPeers() {
		return provider.getQuorumPeers();
	}

	public String getServerState() {
		return provider.getServerState();
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder(super.toString());
		String state = getServerState();
		if (state.equals(Provider.LEADING_STATE)) {
			sb.append("Followers:");
			for (String f : getQuorumPeers()) {
				sb.append(" ").append(f);
			}
			sb.append("\n");
		} else if (state.equals(Provider.FOLLOWING_STATE) || state.equals(Provider.OBSERVING_STATE)) {
			sb.append("Leader: ");
			String[] ldr = getQuorumPeers();
			if (ldr.length > 0)
				sb.append(ldr[0]);
			else
				sb.append("not connected");
			sb.append("\n");
		}
		return sb.toString();
	}
}
